Forcable conscription of Afghan men into a training regiments they can't do runner from
Train them up here and then ship them back to fight, why we have continued to try and train them over there is a mystery when there is no shortage of manpower here to conscript. It would also neatly discourage them from making a bee-line here in future.
Think back to Hong Kong and the Vietnamese boat people.
They'd arrive floating on a bicycle innertube, get locked in an internment camp, after a few months they'd get taken to the airport and delivered back to Vietnam in a C-130.
The amount of time and money it takes to get Mohammed or Yusuf smuggled to the UK they could only afford to do the trip once. So just fly them back whence they came using crab air - word would spread and the flood would slow.